PublicRoutes tells you how to get from point A to point B using public transportation.

Just type in the start and end addresses and the site spits out detailed directions on how to reach your destination. (You might have to walk a bit to reach, say, a bus stop or subway station.) You also get a map of the route and options to e-mail, SMS or print the directions. Yep, it's like MapQuest for public transportation. At present, PublicRoutes covers only about a dozen U.S. cities and London. Hopefully it'll add a lot more in the future, as this is one convenient site for anyone living in or visiting a big city.